In September 2009 I started to rebuild a site using a TomCat hosted web server I had developed that improved upon many good ideas found in Drupal.
In December 2009 I discovered Google's AppEngine, saw the potential, and decided to re-target my system to use this technology. The system, being SQL based, used a Link table technique to create joins. That is, a table consisting of the columns parent-id and child- id maps a many-many relationship of the tables to be joined. The other use cases, namely one-one, one-many, many-one are just special cases of this general case. I believe this technique maps very well into the Datastore environment. I have set up a site at http://www.rexcel.ca:8888/gems/bbb/load.home which both demonstrates and describes this technique. In particular, link http://www.rexcel.ca:8888/gems/bbb/load.syswiki?ww=701000016#hdr-1-3 describes the link record. (By signing in as userid=visitor password=your_name the system will activate a read-only mode for many functions such as the permission system that uses this technique heavily.) If there is enough interest I am prepared to make the code available. Steve Pritchard PS. The site also demonstrates a JDO modeling technology but that is another thread. On Feb 12, 4:44 pm, "Max Ross (Google)" <maxr+appeng...@google.com> wrote: > http://gae-java-persistence.blogspot.com/2010/02/truth-about-joins.html -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
